Ranch

1/2 LG onion
1 LG potato (about 1 cup
1.5 cup water
1/2 cup raw cashews
1/2 tbsp vinegar
1-2 LG garlic cloves
1/4 tsp garlic powder
1/4 tsp onion powder
1/4 tsp mustard powder
1/4 tsp dried dill
1/2 tbsp dried parsley
1 tbsp salt